GitLab

This updates the permission prompt (infobar and permission bubble)
icons with the new icons provided by sgabriel@:
https://drive.google.com/a/google.com/folderview?id=0B-Vmdj5n-
YddWktRd1BMeHZYWWs&usp=sharing

BUG=451490

Review URL: https://codereview.chromium.org/893603003

Cr-Commit-Position: refs/heads/master@{#314007}